The lesson of the story is that courage and determination can lead to incredible achievements. Through Lucy's bravery and willingness to confront challenges, she is able to save the enchanted forest from an evil sorcerer. The story also highlights the importance of friendship and the beauty of embracing one's imagination and the wonders of the natural world. It teaches us to believe in ourselves, to never give up in the face of adversity, and to cherish and protect the magic that exists in our lives.